S&S Electronic Compression Release Assembly Big Twin Softail Dyna Touring FatboyS&S Electronic Compression Release Assembly Big Twin Softail Dyna Touring Fatboy. This item is new, please look at pictures for condition. S&S Cycle part 90 4914 is an electronic compression release assembly designed specifically for high displacement, high compression Harley Davidson Big Twin engines equipped with aftermarket S&S cylinder heads. It is primarily a replacement component for existing S&S electric compression release kits. Critical
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